diff options
| author |   Florin Coras <fcoras@cisco.com> | 2019-08-07 19:12:38 -0700 |
|---|---|---|
| committer |   John Lo <loj@cisco.com> | 2019-08-09 16:25:14 +0000 |
| commit | ec25b91ad3d4aad0f3791f57eb8c24c487f675ca (patch) | |
| tree | 0c689aceddac6ac195d8c028dc9123d33171e8ce | |
| parent | 1403fe604729078fb8a5e1f73cac1ae7ca4b8a8d (diff) | |
session: allow closed transports to send
Type:fix
Transports like tcp may notify session layer of a close but they may
defer the connection's deletion (e.g., tcp time-wait). During that time,
transports may still want to send packets. So, unless the session has no
transport (transport-deleted state), allow the transport to send.
Change-Id: I3ae335c7b951ff64be8529a5e3f3ad790feddc84
Signed-off-by: Florin Coras <fcoras@cisco.com>
(cherry picked from commit a678974cc52ac61dd6094c3f6649f9e3202be1cb)
| -rw-r--r-- | src/vnet/session/session_node.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c index c2e3dd005a8..5af54a8165a 100644 --- a/src/vnet/session/session_node.c +++ b/src/vnet/session/session_node.c @@ -512,12 +512,21 @@ session_tx_not_ready (session_t * s, u8 peek_data) { if (peek_data) { + if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY)) + return 0; /* Can retransmit for closed sessions but can't send new data if * session is not ready or closed */ - if (s->session_state < SESSION_STATE_READY) + else if (s->session_state < SESSION_STATE_READY) return 1; - if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED) - return 2; + else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED) + { + /* Allow closed transports to still send custom packets. + * For instance, tcp may want to send acks in time-wait. */ + if (s->session_state != SESSION_STATE_TRANSPORT_DELETED + && (s->flags & SESSION_F_CUSTOM_TX)) + return 0; + return 2; + } } return 0; } @@ -639,7 +648,6 @@ session_tx_fifo_read_and_snd_i (session_worker_t * wrk, tp = session_get_transport_proto (ctx->s); ctx->transport_vft = transport_protocol_get_vft (tp); ctx->tc = session_tx_get_transport (ctx, peek_data); - ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc); if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH)) { @@ -653,6 +661,9 @@ session_tx_fifo_read_and_snd_i (session_worker_t * wrk, ctx->s->flags &= ~SESSION_F_CUSTOM_TX; n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, max_burst); *n_tx_packets += n_custom_tx; + if (PREDICT_FALSE + (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)) + return SESSION_TX_OK; max_burst -= n_custom_tx; if (!max_burst) { @@ -661,6 +672,7 @@ session_tx_fifo_read_and_snd_i (session_worker_t * wrk, } } + ctx->snd_mss = ctx->transport_vft->send_mss (ctx->tc); ctx->snd_space = transport_connection_snd_space (ctx->tc, vm->clib_time. last_cpu_time, |